Diagnosis & Repair
WARNING: This page is about a different car, the 2003 Toyota Matrix and 2003 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
For diagnosis and repair, see Fig 1. To check speedometer circuit, see appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. To check ECM inputs and outputs, see PIN VOLTAGE CHARTS article. To replace ECM, see REMOVAL & INSTALLATION - 4-CYLINDER article.